Delta NANOTRACE DF-745 Instruction Manual Page 93

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Appendix B Hydrogen Service Safety System DF-745 89
15 Appendix B – Hydrogen Service
Safety System
The Hydrogen Service Safety System is designed to safeguard the DF-745 from
explosion hazards when operating on hydrogen sample gas under normal pressure and flow
conditions as described in this manual. The instrument chassis and the remote pump, if
equipped, are both protected by maintaining a safe condition within their respective
enclosures.
If equipped with this option at the time of shipment from the factory, the analyzer will be set
for Hydrogen operation through the GSF screen and the Hydrogen Safety Service System
will automatically be enabled.
15.1 Instrument
Air circulation fans pull air in through the front door (and vent through the rear) of
the chassis. The fans are rated at 50 cfm (125 cfm max) which will maintain the
internal chassis space below the lower explosive limit (LEL)
1
.
Sample delivery interlock valve blocks flow of sample gas from entering the
instrument chassis under various conditions as described below. It consists of a
normally closed pneumatically actuated UHP springless diaphragm valve positioned
on the sample inlet bulkhead.
Analyzer case purge valve introduces nitrogen purge flow into the chassis upon
closure of the sample delivery interlock valve. It consists of a normally open
pneumatically actuated valve which feeds a customer supplied and regulated source
of nitrogen purge gas through a bulkhead on the rear of the cabinet.
2
Instrument controls and logic
3
default, manage and actuate the above mentioned
components to maintain safe operating conditions.
15.2 Vacuum Pump
If equipped with a vacuum pump, an enclosure equipped with a nitrogen case purge
is provided for the vacuum pump to maintain a safe condition. In addition, an
interlock is provided to detect and react to loss of Nitrogen purge flow. See Figure
86 on page 94.
15.3 Installation
If equipped with this safety system, the analyzer installation procedure is modified as
follows:
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